/*
* ExtMapTypeControl Class v1.3 
*  Copyright (c) 2007, Google 
*  Author: Pamela Fox, others
* 
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* 
*       http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This class lets you add a control to the map which mimics GMapTypeControl
*  and allows for the addition of a traffic button/traffic key.
*/

/*
 * Constructor for ExtMapTypeControl, which uses an option hash
 * to decide what elements to put in the control.
 * @param {opt_opts} Named optional arguments:
 *   opt_opts.showTraffic {Boolean} Controls whether traffic button is shown
 *   opt_opts.showTrafficKey {Boolean} Controls whether traffic key is shown
 */
function ExtMapTypeControl(opt_opts) {
  this.options = opt_opts || {};
};


ExtMapTypeControl.prototype = new GControl();

/**
 * Is called by GMap2's addOverlay method. Creates the button 
 *  and appends to the map div.
 * @param {GMap2} map The map that has had this ExtMapTypeControl added to it.
 * @return {DOM Object} Div that holds the control
 */ 
ExtMapTypeControl.prototype.initialize = function(map) {
  var container = document.createElement("div");
  var me = this;

  var mapTypes = map.getMapTypes();
  var mapTypeDivs = me.addMapTypeButtons_(map);

  GEvent.addListener(map, "addmaptype", function() {
    var newMapTypes = map.getMapTypes();
    var newMapType = newMapTypes.pop();
    var newMapTypeDiv = me.createButton_(newMapType.getName());
    newMapTypeDiv.setAttribute('title', newMapType.getAlt());
    mapTypes.push(newMapType);
    mapTypeDivs.push(newMapTypeDiv);
    me.resetButtonEvents_(map, mapTypeDivs);
    container.appendChild(newMapTypeDiv);
  });
  GEvent.addListener(map, "removemaptype", function() {
    for (var i = 0; i < mapTypeDivs.length; i++) {
      GEvent.clearListeners(mapTypeDivs[i], "click");
      container.removeChild(mapTypeDivs[i]);
    }
    mapTypeDivs = me.addMapTypeButtons_(map);
    me.resetButtonEvents_(map, mapTypeDivs);
    for (var i = 0; i < mapTypeDivs.length; i++ ) {
      container.appendChild(mapTypeDivs[i]);
    }
  });

  if (me.options.showTraffic) {
    var trafficDiv = me.createButton_("Traffic");
    trafficDiv.setAttribute('title', 'Show Traffic');
    trafficDiv.style.marginRight = "8px";
    trafficDiv.style.visibility = 'hidden';
    trafficDiv.firstChild.style.cssFloat = "left";
    trafficDiv.firstChild.style.styleFloat = "left";
    // Sending true makes overlay hidden by default
    me.trafficInfo = new GTrafficOverlay({hide:true});
    me.trafficInfo.hidden = true;
    // We have to do this so that we can sense if traffic is in view
    GEvent.addListener(me.trafficInfo, "changed", function(hasTrafficInView) {
      if (hasTrafficInView) {
        trafficDiv.style.visibility = 'visible';
      } else {
        trafficDiv.style.visibility = 'hidden';
      }
    });
    map.addOverlay(me.trafficInfo);

    GEvent.addDomListener(trafficDiv.firstChild, "click", function() {
      if (me.trafficInfo.hidden) {
        me.trafficInfo.hidden = false;
        me.trafficInfo.show();
      } else {
        me.trafficInfo.hidden = true;
        me.trafficInfo.hide();
      }
      me.toggleButton_(trafficDiv.firstChild, !me.trafficInfo.hidden);
    });

    if (me.options.showTrafficKey) {
      keyDiv = document.createElement("div");
      keyDiv.style.cssFloat = "left";
      keyDiv.style.styleFloat = "left";
      keyDiv.innerHTML = "&nbsp;?&nbsp;";
  
      var keyExpandedDiv = document.createElement("div");
      keyExpandedDiv.style.clear = "both";
      keyExpandedDiv.style.padding = "2px";
      var keyInfo = [{"color": "#30ac3e", "text": "&gt; 50 MPH"},
                     {"color": "#ffcf00", "text": "25-50 MPH"},
                     {"color": "#ff0000", "text": "&lt; 25 MPH"},
                     {"color": "#c0c0c0", "text": "No data"}];
      for (var i = 0; i < keyInfo.length; i++) {
        keyExpandedDiv.innerHTML += "<div style='text-align: left'><span style='background-color: " + keyInfo[i].color + "'>&nbsp;&nbsp</span>"
            +  "<span style='color: " + keyInfo[i].color + "'> " + keyInfo[i].text + " </span>" + "</div>"; 
      }
      keyExpandedDiv.style.display = "none";

      GEvent.addDomListener(keyDiv, "click", function() {
        if (me.keyExpanded) {
          me.keyExpanded = false;
          keyExpandedDiv.style.display = "none";
        } else {
          me.keyExpanded = true;
          keyExpandedDiv.style.display = "block";
        }
        me.toggleButton_(keyDiv, me.keyExpanded);
      });

      me.toggleButton_(keyDiv, me.keyExpanded);
    }

    var separatorDiv = document.createElement("div");
    separatorDiv.style.clear = "both";

    if (me.options.showTrafficKey) trafficDiv.appendChild(keyDiv);
    trafficDiv.appendChild(separatorDiv);
    if (me.options.showTrafficKey) trafficDiv.appendChild(keyExpandedDiv);
    me.toggleButton_(trafficDiv.firstChild, false);

    container.appendChild(trafficDiv);
  }

  for (var i = 0; i < mapTypeDivs.length; i++ ) {
    container.appendChild(mapTypeDivs[i]);
  }

  map.getContainer().appendChild(container);

  return container;
};

/*
 * Creates buttons for map types.
 * @param {GMap2} Map object for which to create buttons.
 * @return {Array} Divs containing the buttons.
 */
ExtMapTypeControl.prototype.addMapTypeButtons_ = function(map) {
  var me = this;
  var mapTypes = map.getMapTypes();
  var mapTypeDivs = new Array();
  for (var i = 0; i < mapTypes.length; i++) {
    mapTypeDivs[i] = me.createButton_(mapTypes[i].getName());
    mapTypeDivs[i].setAttribute('title', mapTypes[i].getAlt());
  }
  me.resetButtonEvents_(map, mapTypeDivs);
  return mapTypeDivs;
};

/*
 * Ensures that map type button events are assigned correctly.
 * @param {GMap2} Map object for which to reset events.
 * @param {Array} mapTypeDivs Divs containing map type buttons.
 */
ExtMapTypeControl.prototype.resetButtonEvents_ = function(map, mapTypeDivs) {
  var me = this;
  var mapTypes = map.getMapTypes();
  for (var i = 0; i < mapTypeDivs.length; i++) {
    var otherDivs = new Array;
    for (var j = 0; j < mapTypes.length; j++ ) {
      if (j != i) {
        otherDivs.push(mapTypeDivs[j]);
      }
    }
    me.assignButtonEvent_(mapTypeDivs[i], map, mapTypes[i], otherDivs);
  }
  GEvent.addListener(map, "maptypechanged", function() {
    var divIndex = 0;
    var mapType = map.getCurrentMapType();
    for (var i = 0; i < mapTypes.length; i++) {
      if (mapTypes[i] == mapType) {
        divIndex = i;
      }
    }
    GEvent.trigger(mapTypeDivs[divIndex], "click");
  });
};

/*
 * Creates simple buttons with text nodes. 
 * @param {String} text Text to display in button
 * @return {DOM Object} The div for the button.
 */
ExtMapTypeControl.prototype.createButton_ = function(text) {
  var buttonDiv = document.createElement("div");
  this.setButtonStyle_(buttonDiv);
  buttonDiv.style.cssFloat = "left";
  buttonDiv.style.styleFloat = "left";
  var textDiv = document.createElement("div");
  textDiv.appendChild(document.createTextNode(text));
  textDiv.style.width = "6em";
  buttonDiv.appendChild(textDiv);
  return buttonDiv;
};

/*
 * Assigns events to MapType buttons to change maptype
 *  and toggle button styles correctly for all buttons
 *  when button is clicked.
 *  @param {DOM Object} div Button's div to assign click to
 *  @param {GMap2} Map object to change maptype of.
 *  @param {Object} mapType GMapType to change map to when clicked
 *  @param {Array} otherDivs Array of other button divs to toggle off
 */  
ExtMapTypeControl.prototype.assignButtonEvent_ = function(div, map, mapType, otherDivs) {
  var me = this;

  GEvent.addDomListener(div, "click", function() {
    for (var i = 0; i < otherDivs.length; i++) {
      me.toggleButton_(otherDivs[i].firstChild, false);
    }
    me.toggleButton_(div.firstChild, true);
    map.setMapType(mapType);
  });
};

/*
 * Changes style of button to appear on/off depending on boolean passed in.
 * @param {DOM Object} div  Button div to change style of
 * @param {Boolean} boolCheck Used to decide to use on style or off style
 */
ExtMapTypeControl.prototype.toggleButton_ = function(div, boolCheck) {
   div.style.fontWeight = boolCheck ? "bold" : "";
   div.style.border = "1px solid white";
   var shadows = boolCheck ? ["Top", "Left"] : ["Bottom", "Right"];
   for (var j = 0; j < shadows.length; j++) {
     div.style["border" + shadows[j]] = "1px solid #b0b0b0";
  } 
};

/*
 * Required by GMaps API for controls. 
 * @return {GControlPosition} Default location for control
 */
ExtMapTypeControl.prototype.getDefaultPosition = function() {
  return new GControlPosition(G_ANCHOR_TOP_RIGHT, new GSize(7, 7));
};

/*
 * Sets the proper CSS for the given button element.
 * @param {DOM Object} button Button div to set style for
 */
ExtMapTypeControl.prototype.setButtonStyle_ = function(button) {
  button.style.color = "#000000";
  button.style.backgroundColor = "white";
  button.style.font = "small Arial";
  button.style.border = "1px solid black";
  button.style.padding = "0px";
  button.style.margin= "0px";
  button.style.textAlign = "center";
  button.style.fontSize = "12px"; 
  button.style.cursor = "pointer";
};
